The group of sepals is called a calyx.
The calyx is the outermost whorl of a flower, consisting of sepals. Sepals are modified leaves that protect the developing flower bud. They are typically green and enclose the other floral parts, such as the petals, stamens, and pistil, when the flower is in bud.
Here's a more detailed look:
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Function: The primary function of the calyx is protection. It shields the delicate flower parts from environmental factors like frost, heat, and physical damage, as well as from insects before the flower opens.
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Structure: The sepals can be separate (aposepalous) or fused together (gamosepalous). The shape and size of the sepals can vary greatly among different plant species.
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Persistence: In some plants, the calyx persists after the flower has bloomed and may even enlarge to protect the developing fruit.
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Aestivation: The arrangement of sepals in the bud is called aestivation. Different types of aestivation include valvate, twisted, imbricate, and quincuncial.
In summary, the calyx, composed of sepals, is a vital protective structure for the developing flower.
